Rear of Vehicle High w/o F45
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||
1 | Did you perform the ALC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the suspension position sensor is within the specified range? | 0.25-2.5 V | Go to Step 8 | Go to Step 3 |
3 | With the scan tool command the exhaust solenoid open, to vent the system (an audible hiss sound may be heard) . Did the ALC system vent and the vehicle lower? | -- | Go to Step 4 | Go to Step 6 |
4 | Observe the suspension position sensor reading on the scan tool. Did the suspension position sensor reading change more than 1 volt? | -- | Go to Step 8 | Go to Step 5 |
5 |
Important: The vehicle must be raised on a drive on lift. Full vehicle weight must be on the rear tires. Care must be used when disconnecting and retaining the suspension position sensor link. If the link is allowed to travel freely, a false DTC may be set.
Did the suspension position sensor reading change more than 1 volt? | -- | Go to Step 8 | Go to Step 9 |
6 |
Important: The vehicle must be raised on a drive on lift. Full vehicle weight must be on the rear tires.
Did the ALC system vent and the vehicle lower? | -- | Go to Step 10 | Go to Step 7 |
7 | Disconnect the air tube assembly from both shock absorbers. Did the vehicle lower? | -- | Go to Step 11 | Go to Step 12 |
8 | Perform the ALC relearn procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Did you complete the procedure? | -- | Go to Step 16 | -- |
9 | Inspect the poor connections/ terminal tension at the harness connector of the suspension position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 |
10 | Inspect for poor connections/ terminal tension at the harness connector of the Automatic Level Control Compressor Assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14 |
11 | Replace the air tube assembly. Refer to Air Tube Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
12 | Replace the shock that did not lower. Refer to Shock Absorber Replacement Did you complete the replacement? | -- | Go to Step 15 | -- |
13 |
Important Body Control Module (BCM) Programming/RPO Configuration : Perform the ALC relearn procedure after position sensor replacement. Replace the suspension position sensor. Refer to Automatic Level Control Sensor Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
14 | Replace the automatic level control compressor head assembly. Refer to Automatic Level Control Air Compressor Head Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
15 | Operate the vehicle within the conditions for enabling the automatic level control. Does the ALC operate correctly? | -- | System OK | Go to Step 2 |
16 | Operate the vehicle within the conditions for enabling the automatic level control. Does the ALC operate correctly? | -- | System OK | Go to Step 3 |
Rear of Vehicle High w/F45
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||
1 | Did you perform the Automatic Level Control (ALC) Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is the ALC air compressor running for more than 5 minutes? | -- | Go to Step 3 | Go to Step 6 |
3 |
Is the air compressor running? | -- | Go to Step 4 | Go to Step 5 |
4 |
Is the repair complete? | -- | Go to Step 13 | Go to Step 1 |
5 |
Is the repair complete? | -- | Go to Step 13 | Go to Step 1 |
6 | Inspect the left and right rear position sensors for damage and disconnected links. Are any damaged sensors or disconnected links present? | -- | Go to Step 7 | Go to Step 8 |
7 | Replace the damaged rear position sensor or reconnect the link. Refer to Automatic Level Control Sensor Replacement . Is the repair complete? | -- | Go to Step 13 | Go to Step 1 |
8 |
Is air exiting the ALC intake air filter? | -- | Go to Step 11 | Go to Step 9 |
9 |
Is air exiting both of the air tubes at the ALC air dryer connection? | -- | Go to Step 10 | Go to Step 12 |
10 |
Are all of the replacements and/or installations complete? | -- | Go to Step 13 | -- |
11 |
Has the ALC relearn procedure been completed? | -- | Go to Step 13 | -- |
12 | Replace the air tube going from the air dryer to both rear shock absorbers. Refer to Air Tube Replacement . Is the repair complete? | -- | Go to Step 13 | -- |
13 |
Is the rear of the vehicle trim level? | -- | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 1 |
